$belong[layout.html]
<h2>数据绑定支持</h2>

<ul id="list">
    <li><input type="text" id="email" class="first" data-url="http://github.com" data-valid="{required:true,type:'email'}"></li>
</ul>

<script class="code">

console.log( $("#list > li > input").first().data("valid") );

$("#email").data("valid",{date: +new Date});

console.log( $(".first").data("valid") );

</script>